# Active Directory

- [Microsoft Graph](/extensibility-and-integration/products/active-directory/microsoft-graph.md)
- [Overview](/extensibility-and-integration/products/active-directory/microsoft-graph/overview.md)
- [Tutorials](/extensibility-and-integration/products/active-directory/microsoft-graph/tutorials.md)
- [How to Guides](/extensibility-and-integration/products/active-directory/microsoft-graph/how-to-guides.md)
- [Create App Registration](/extensibility-and-integration/products/active-directory/microsoft-graph/how-to-guides/create-app-registration.md)
- [Limit Permissions to a Specific Mailbox](/extensibility-and-integration/products/active-directory/microsoft-graph/how-to-guides/limit-permissions-to-a-specific-mailbox.md): This document describes how to limit the permissions for an App Registration to a specific mailbox or a set of mailboxes.
- [OpenID](/extensibility-and-integration/products/active-directory/openid.md)
- [UPN Transformation](/extensibility-and-integration/products/active-directory/openid/upn-transformation.md): Flow Classic.